bump maven-compiler, maven-source plugin

Author: osheroff

pom.xml

@@ -103,7 +103,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.5.1</version>
+                <version>3.8.1</version>
                 <configuration>
                     <release>11</release>
                 </configuration>
@@ -213,7 +213,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
-                        <version>3.0.1</version>
+                        <version>3.8.1</version>
                         <executions>
                             <execution>
                                 <id>attach-sources</id>